Potassium test cost in Chicago, IL
In Chicago-Naperville-Elgin, IL-IN, 63 hospitals list a cash price for potassium blood test: from $4.00 to $149.64, with a median of $28.64. The lowest listed price is at Saint Joseph Medical Center - Joliet and 2 other hospitals — $24.64 less than the median here. Across Illinois, the median is $44.80 at 114 hospitals.
Cash prices at 63 facilities across 45 cities for code 84132, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 29, 2026; the hospital files themselves were last updated between Mar 17, 2025 and Sep 1, 2026.
Lowest$4.00Saint Joseph Medical Center - Joliet + 2 more
Median$28.64half of hospitals charge less
Highest$149.64in this market
Difference37.4×highest vs lowest
Where each hospital's price falls
Each dot is one hospital's cash price on a scale from the lowest to the highest in Chicago-Naperville-Elgin, IL-IN.
median
Lowest $4.00Highest $149.64
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| Saint Joseph Medical Center - Joliet lowest Joliet, IL · (815) 725-7133 POTASSIUM WHOLE BLOOD VENOUS+2 more lines at this price File of Sep 1, 2026 · source file | $4.00 | $94.00 | $2.86–$94.00 | 96% |
| Mercy Medical Center lowest Aurora, IL · (630) 859-2222 POTASSIUM File of Sep 1, 2026 · source file | $4.00 | $101.00 | $2.86–$101.00 | 96% |
| Saint Francis Hospital lowest Evanston, IL · (847) 316-4000 HC ASSAY OF SERUM POTASSIUM File of Sep 1, 2026 · source file | $4.00 | $42.00 | $2.86–$42.00 | 90% |
| Uchicago Medicine AdventHealth La Grange La Grange, IL · (708) 352-1200 HC POTASSIUM LEVEL File of Apr 1, 2026 · source file | $4.25 | $17.00 | — | 75% |
| Uchicago Medicine AdventHealth Bolingbrook Bolingbrook, IL · (630) 312-5000 HC POTASSIUM LEVEL File of Apr 1, 2026 · source file | $4.25 | $17.00 | — | 75% |
| Uchicago Medicine AdventHealth Glenoaks Glendale Heights, IL · (630) 545-8000 HC POTASSIUM LEVEL File of Apr 1, 2026 · source file | $4.25 | $17.00 | — | 75% |
| Uchicago Medicine AdventHealth Hinsdale Hinsdale, IL · (630) 856-9000 HC POTASSIUM LEVEL File of Apr 1, 2026 · source file | $4.25 | $17.00 | — | 75% |
| Roseland Community Hospital Chicago, IL · (773) 995-3000 Blood potassium level File of Jul 1, 2026 · source file | $5.50 | $62.00 | $4.43–$68.20 | 91% |
| John H. Stroger, Jr. Hospital Chicago, IL · (312) 864-6000 POTASSIUM SERUM source file | $8.40 | $12.00 | $1.29–$39.11 | 30% |
| Franciscan Health Munster Munster, IN · (219) 922-4200 Assay of Serum Potassium source file | $9.37 | $44.00 | $3.76–$109.00 | 79% |
| Presence Saint Joseph Hospital - Chicago Chicago, IL · (773) 665-3000 HC POTASSIUM-SERUM+3 more lines at this price source file | $13.86 | $42.00 | $4.76–$20.43 | 67% |
| Northwestern Lake Forest Hospital Lake Forest, IL · (847) 234-5600 HB Potassium Epoc (POCT) File of Apr 1, 2026 · source file | $15.40 | $22.00 | $3.65–$22.00 | 30% |
| Franciscan Health Munster Munster, IN · (219) 922-4200 Assay of Serum Potassium 934 source file | $15.55 | $73.00 | $3.76–$109.00 | 79% |
| Community First Medical Center Chicago, IL · (773) 282-7000 Blood potassium level File of Apr 1, 2026 · source file | $16.75 | $33.50 | $1.59–$33.50 | 50% |
| Franciscan Health Rensselaer Rensselaer, IN · (219) 866-5141 Assay of Serum Potassium+1 more line at this price source file | $17.54 | $49.00 | $4.26–$39.20 | 64% |
| Humboldt Park Health Chicago, IL · (773) 292-8200 Blood potassium level File of Aug 24, 2026 · source file | $19.40 | $69.30 | $69.30 | 72% |
| Gottlieb Memorial Hospital Melrose Park, IL · (708) 681-3200 Anes Analys Potassium Serum+3 more lines at this price File of Mar 31, 2026 · source file | $19.57 | $103.00 | $43.88–$86.31 | 81% |
| MacNeal Hospital Berwyn, IL · (708) 783-9100 Anes Analys Potassium Serum+3 more lines at this price File of Mar 31, 2026 · source file | $19.57 | $103.00 | $0.82–$142.66 | 81% |
| Franciscan Health Dyer Dyer, IN · (219) 865-2141 Assay of Serum Potassium 934 source file | $19.71 | $73.00 | $4.26–$109.00 | 73% |
| Franciscan Health Munster Munster, IN · (219) 922-4200 Assay of Serum Potassium 1257 source file | $21.09 | $99.00 | $3.76–$109.00 | 79% |
| La Rabida Children's Hospital Chicago, IL · (773) 363-6700 ISTAT POTASSIUM File of Apr 1, 2026 · source file | $21.30 | $21.30 | — | — |
| Franciscan Health Dyer Dyer, IN · (219) 865-2141 Assay of Serum Potassium-ER+3 more lines at this price source file | $22.14 | $82.00 | $4.26–$109.00 | 73% |
| Franciscan Health Dyer one side Dyer, IN · (219) 865-2141 HC Assay Fo Serum Potassium-Rt source file | $22.14 | $82.00 | $4.26–$109.00 | 73% |
| Loyola University Medical Center Maywood, IL · (708) 216-9000 Potassium, Serum (K)+3 more lines at this price File of Mar 31, 2026 · source file | $23.69 | $103.00 | $6.41–$108.56 | 77% |
| Advocate Good Shepherd Hospital Barrington, IL · (847) 381-9600 POC POTASSIUM SERUM File of Nov 4, 2025 · source file | $27.50 | $55.00 | $4.76–$44.00 | 50% |
| Advocate Condell Medical Center Libertyville, IL · (847) 362-2900 POC POTASSIUM SERUM File of Nov 4, 2025 · source file | $27.50 | $55.00 | $4.76–$44.00 | 50% |
| Advocate Illinois Masonic Medical Center Chicago, IL · (773) 975-1600 POC POTASSIUM SERUM File of Nov 4, 2025 · source file | $27.50 | $55.00 | $4.76–$44.77 | 50% |
| Advocate Childrens Hospital Park Ridge Park Ridge, IL POC POTASSIUM SERUM File of Nov 4, 2025 · source file | $27.50 | $55.00 | $4.76–$48.95 | 50% |
| Advocate Lutheran General Hospital Park Ridge, IL · (847) 723-2210 POC POTASSIUM SERUM File of Nov 4, 2025 · source file | $27.50 | $55.00 | $4.76–$48.95 | 50% |
| Advocate Childrens Hospital Oak Lawn Oak Lawn, IL POC POTASSIUM SERUM File of Nov 4, 2025 · source file | $27.50 | $55.00 | $4.76–$44.00 | 50% |
| Advocate South Suburban Hospital Hazel Crest, IL POC POTASSIUM SERUM File of Nov 4, 2025 · source file | $27.50 | $55.00 | $4.76–$53.57 | 50% |
| Advocate Trinity Hospital Chicago, IL · (773) 967-5002 POC POTASSIUM SERUM File of Nov 4, 2025 · source file | $27.50 | $55.00 | $4.76–$44.00 | 50% |
| Advocate Christ Medical Center Oak Lawn, IL · (708) 684-8000 POC POTASSIUM SERUM File of Nov 4, 2025 · source file | $27.50 | $55.00 | $4.76–$44.00 | 50% |
| Advocate Sherman Hospital Elgin, IL · (847) 742-9800 POC POTASSIUM SERUM File of Nov 4, 2025 · source file | $27.50 | $55.00 | $4.76–$49.50 | 50% |
| Advocate Good Samaritan Hospital Downers Grove, IL · (630) 275-5900 POC POTASSIUM SERUM File of Nov 4, 2025 · source file | $27.50 | $55.00 | $4.76–$44.00 | 50% |
| Franciscan Health Crown Point Crown Point, IN · (219) 757-6100 Assay of Serum Potassium-ER+4 more lines at this price source file | $28.64 | $111.00 | $111.00 | 74% |
| Resilience Healthcare West Suburban Medical Center Oak Park, IL · (708) 383-6200 84132 POTASSIUM SERUM PLASMA/WHOLE BLOOD File of Mar 17, 2025 · source file | $29.79 | $87.61 | $4.62–$56.95 | 66% |
| La Rabida Children's Hospital Chicago, IL · (773) 363-6700 AFT POTASSIUM - STAT+1 more line at this price File of Apr 1, 2026 · source file | $29.92 | $29.92 | — | — |
| Morris Hospital Morris, IL · (815) 942-2932 Blood potassium level File of Jun 30, 2026 · source file | $32.96 | $137.00 | $4.76–$116.45 | 76% |
| Advocate Lutheran General Hospital Park Ridge, IL · (847) 723-2210 POTASSIUM SERUM File of Nov 4, 2025 · source file | $37.50 | $75.00 | $4.76–$66.75 | 50% |
| Advocate Good Shepherd Hospital Barrington, IL · (847) 381-9600 POTASSIUM SERUM File of Nov 4, 2025 · source file | $37.50 | $75.00 | $4.76–$60.00 | 50% |
| Advocate Condell Medical Center Libertyville, IL · (847) 362-2900 POTASSIUM SERUM File of Nov 4, 2025 · source file | $37.50 | $75.00 | $4.76–$60.00 | 50% |
| Advocate South Suburban Hospital Hazel Crest, IL POTASSIUM SERUM File of Nov 4, 2025 · source file | $37.50 | $75.00 | $4.76–$73.05 | 50% |
| Advocate Illinois Masonic Medical Center Chicago, IL · (773) 975-1600 POTASSIUM SERUM File of Nov 4, 2025 · source file | $37.50 | $75.00 | $4.76–$61.05 | 50% |
| Advocate Childrens Hospital Park Ridge Park Ridge, IL POTASSIUM SERUM File of Nov 4, 2025 · source file | $37.50 | $75.00 | $4.76–$66.75 | 50% |
| Advocate Sherman Hospital Elgin, IL · (847) 742-9800 POTASSIUM SERUM File of Nov 4, 2025 · source file | $37.50 | $75.00 | $4.76–$67.50 | 50% |
| Advocate Good Samaritan Hospital Downers Grove, IL · (630) 275-5900 POTASSIUM SERUM File of Nov 4, 2025 · source file | $37.50 | $75.00 | $4.76–$60.00 | 50% |
| Advocate Christ Medical Center Oak Lawn, IL · (708) 684-8000 POTASSIUM SERUM File of Nov 4, 2025 · source file | $37.50 | $75.00 | $4.76–$60.00 | 50% |
| Advocate Trinity Hospital Chicago, IL · (773) 967-5002 POTASSIUM SERUM File of Nov 4, 2025 · source file | $37.50 | $75.00 | $4.76–$60.00 | 50% |
| Advocate Childrens Hospital Oak Lawn Oak Lawn, IL POTASSIUM SERUM File of Nov 4, 2025 · source file | $37.50 | $75.00 | $4.76–$60.00 | 50% |
| Shriners Childrens - Chicago Chicago, IL · (773) 622-5400 ASSAY OF SERUM POTASSIUM source file | $39.40 | $39.40 | $4.23–$9.18 | — |
| Northwest Health - Porter Valparaiso, IN · (219) 983-8300 Blood Gas Potassium DM Arterial+4 more lines at this price File of Apr 1, 2026 · source file | $39.69 | $147.00 | $4.19–$123.48 | 73% |
| Northwestern Memorial Hospital Chicago, IL · (312) 926-2000 HB Potassium, Blood (Bg) File of Apr 1, 2026 · source file | $41.30 | $59.00 | $13.81–$78.00 | 30% |
| Northwestern Medicine McHenry Hospital McHenry, IL · (815) 344-5000 HB Potassium, Blood (Bg) File of Apr 1, 2026 · source file | $41.30 | $59.00 | $11.39–$59.00 | 30% |
| Northwestern Lake Forest Hospital Lake Forest, IL · (847) 234-5600 HB Potassium, Blood (Bg) File of Apr 1, 2026 · source file | $41.30 | $59.00 | $9.79–$59.00 | 30% |
| Northwestern Medicine Marianjoy Rehabilitation Hospital Wheaton, IL HB Potassium Level File of Apr 1, 2026 · source file | $41.30 | $59.00 | $24.78–$59.00 | 30% |
| Northwestern Medicine Delnor Hospital Geneva, IL · (630) 208-3000 HB Potassium, Blood (Bg) File of Apr 1, 2026 · source file | $41.30 | $59.00 | $8.79–$59.00 | 30% |
| Northwestern Medicine Central DuPage Hospital Winfield, IL · (630) 682-1600 HB Potassium, Blood (Bg) File of Apr 1, 2026 · source file | $41.30 | $59.00 | $4.07–$59.00 | 30% |
| The Methodist Hospitals Gary, IN · (219) 886-4000 Assay of Serum Potassium+1 more line at this price source file | $42.70 | $61.00 | $4.76–$54.29 | 30% |
| Methodist Hospital-Southlake Merrillville, IN · (219) 886-4000 Assay of Serum Potassium+1 more line at this price source file | $42.70 | $61.00 | $4.76–$54.29 | 30% |
| NorthShore University HealthSystems Skokie Hospital Skokie, IL R Potassium; Serum (P) source file | $42.90 | $66.00 | $8.91–$36.04 | 35% |
| NorthShore University HealthSystems Glenbrook Hospital Glenview, IL R Potassium; Serum (P) source file | $42.90 | $66.00 | $8.91–$36.04 | 35% |
| The University of Chicago Medical Center Chicago, IL · (773) 702-9785 Hc Potassium; Serum, Plasma Or Whole Blood-Laf File of Apr 1, 2026 · source file | $43.00 | $43.00 | — | — |
| Palos Community Hospital Palos Heights, IL · (708) 923-4000 HB Ref Potassium Serum Plasma/Whole Blood (Q) File of Apr 1, 2026 · source file | $43.40 | $62.00 | $9.92–$62.00 | 30% |
| NorthShore University HealthSystems Skokie Hospital Skokie, IL Potassium I-Stat (P)+3 more lines at this price source file | $43.55 | $67.00 | $9.05–$36.58 | 35% |
| NorthShore University HealthSystems Glenbrook Hospital Glenview, IL Potassium I-Stat (P)+3 more lines at this price source file | $43.55 | $67.00 | $9.05–$36.58 | 35% |
| Northwestern Lake Forest Hospital Lake Forest, IL · (847) 234-5600 HB Potassium Istat (POCT)+1 more line at this price File of Apr 1, 2026 · source file | $46.20 | $66.00 | $10.96–$66.00 | 30% |
| Northwestern Medicine Marianjoy Rehabilitation Hospital Wheaton, IL HB Potassium Istat (POCT)+1 more line at this price File of Apr 1, 2026 · source file | $46.20 | $66.00 | $27.72–$66.00 | 30% |
| Northwestern Medicine Central DuPage Hospital Winfield, IL · (630) 682-1600 HB Ref Genova Panel, Potassium RBC (Gva)+1 more line at this price File of Apr 1, 2026 · source file | $46.20 | $66.00 | $4.55–$66.00 | 30% |
| Palos Community Hospital Palos Heights, IL · (708) 923-4000 HB Ref Genova Panel, Potassium RBC (Gva)+1 more line at this price File of Apr 1, 2026 · source file | $46.20 | $66.00 | $10.56–$66.00 | 30% |
| Northwestern Medicine Delnor Hospital Geneva, IL · (630) 208-3000 HB Potassium Istat (POCT)+1 more line at this price File of Apr 1, 2026 · source file | $46.20 | $66.00 | $9.83–$66.00 | 30% |
| Northwestern Medicine McHenry Hospital McHenry, IL · (815) 344-5000 HB Potassium Istat (POCT)+1 more line at this price File of Apr 1, 2026 · source file | $46.20 | $66.00 | $12.74–$66.00 | 30% |
| Northwestern Memorial Hospital Chicago, IL · (312) 926-2000 HB Ref Genova Panel, Potassium RBC (Gva)+1 more line at this price File of Apr 1, 2026 · source file | $46.20 | $66.00 | $12.80–$66.00 | 30% |
| Northwestern Medicine Kishwaukee Hospital DeKalb, IL · (815) 756-1521 HB Potassium Istat (POCT)+1 more line at this price File of Apr 1, 2026 · source file | $46.20 | $66.00 | $12.08–$66.00 | 30% |
| Northwestern Medicine Valley West Hospital Sandwich, IL · (815) 786-8484 HB Potassium Istat (POCT)+1 more line at this price File of Apr 1, 2026 · source file | $46.20 | $66.00 | $12.54–$66.00 | 30% |
| Northwestern Medicine Kishwaukee Hospital DeKalb, IL · (815) 756-1521 HB Ref Potassium, Total, RBC (Arup)+2 more lines at this price File of Apr 1, 2026 · source file | $48.30 | $69.00 | $12.63–$69.00 | 30% |
| Northwestern Medicine Central DuPage Hospital Winfield, IL · (630) 682-1600 HB Ref Potassium, RBC (Q)+2 more lines at this price File of Apr 1, 2026 · source file | $48.30 | $69.00 | $4.76–$69.00 | 30% |
| Northwestern Medicine McHenry Hospital McHenry, IL · (815) 344-5000 HB Ref Potassium, RBC (Q)+2 more lines at this price File of Apr 1, 2026 · source file | $48.30 | $69.00 | $13.32–$69.00 | 30% |
| Northwestern Lake Forest Hospital Lake Forest, IL · (847) 234-5600 HB Ref Potassium, RBC (Q)+1 more line at this price File of Apr 1, 2026 · source file | $48.30 | $69.00 | $11.45–$69.00 | 30% |
| Palos Community Hospital Palos Heights, IL · (708) 923-4000 HB Ref Potassium, RBC (Q)+2 more lines at this price File of Apr 1, 2026 · source file | $48.30 | $69.00 | $11.04–$69.00 | 30% |
| Northwestern Memorial Hospital Chicago, IL · (312) 926-2000 HB Ref Potassium, RBC (Q)+2 more lines at this price File of Apr 1, 2026 · source file | $48.30 | $69.00 | $5.15–$69.00 | 30% |
| Northwestern Medicine Valley West Hospital Sandwich, IL · (815) 786-8484 HB Ref Potassium, RBC (Q)+2 more lines at this price File of Apr 1, 2026 · source file | $48.30 | $69.00 | $13.11–$69.00 | 30% |
| Northwestern Medicine Delnor Hospital Geneva, IL · (630) 208-3000 HB Ref Potassium, RBC (Q)+2 more lines at this price File of Apr 1, 2026 · source file | $48.30 | $69.00 | $10.28–$69.00 | 30% |
| Northwestern Medicine Marianjoy Rehabilitation Hospital Wheaton, IL HB Ref Potassium, RBC (Q)+2 more lines at this price File of Apr 1, 2026 · source file | $48.30 | $69.00 | $28.98–$69.00 | 30% |
| The University of Chicago Medical Center Chicago, IL · (773) 702-9785 Hc Potassium; Serum, Plasma Or Whole Blood File of Apr 1, 2026 · source file | $50.00 | $50.00 | — | — |
| Mercyhealth Hospital & Medical Center - Harvard Harvard, IL · (815) 943-5431 CHG POTASSIUM SERUM PLASMA/WHOLE BLOOD File of Mar 1, 2026 · source file | $51.86 | $69.15 | — | 25% |
| Louis A Weiss Memorial Hospital Chicago, IL · (773) 878-8700 Potassium Level File of Mar 17, 2025 · source file | $52.39 | $154.08 | $4.62–$100.15 | 66% |
| Resilience Healthcare West Suburban Medical Center Oak Park, IL · (708) 383-6200 Potassium Level File of Mar 17, 2025 · source file | $52.39 | $154.08 | $4.62–$100.15 | 66% |
| Mercyhealth Crystal Lake Hospital & Medical Center Crystal Lake, IL · (792) 220-5500 CHG POTASSIUM SERUM PLASMA/WHOLE BLOOD File of Mar 1, 2026 · source file | $52.92 | $70.56 | — | 25% |
| Palos Community Hospital Palos Heights, IL · (708) 923-4000 HB Potassium, Blood (Bg)+1 more line at this price File of Apr 1, 2026 · source file | $54.60 | $78.00 | $12.48–$78.00 | 30% |
| Northwestern Medicine Kishwaukee Hospital DeKalb, IL · (815) 756-1521 HB Potassium Level File of Apr 1, 2026 · source file | $56.70 | $81.00 | $14.82–$81.00 | 30% |
| Northwestern Medicine Delnor Hospital Geneva, IL · (630) 208-3000 HB Potassium Level File of Apr 1, 2026 · source file | $60.90 | $87.00 | $12.96–$87.00 | 30% |
| Ann & Robert H. Lurie Children's Hospital of Chicago Chicago, IL · (312) 227-4000 H POTASSIUM BLOOD GAS POC+2 more lines at this price source file | $65.10 | $93.00 | $15.81–$8,500.00 | 30% |
| Endeavor Health Highland Park Hospital Highland Park, IL HB R POTASSIUM; SERUM (P) File of Apr 1, 2026 · source file | $66.00 | $66.00 | — | — |
| Swedish Covenant Health Chicago, IL · (773) 878-8200 HB R POTASSIUM; SERUM (P) File of Apr 1, 2026 · source file | $66.00 | $66.00 | — | — |
| Northshore University Healthsystem - Evanston Hospital Evanston, IL · (847) 570-2000 HB R POTASSIUM; SERUM (P) File of Apr 1, 2026 · source file | $66.00 | $66.00 | — | — |
| Endeavor Health Highland Park Hospital Highland Park, IL HB POTASSIUM EMER CSU LAB (P)+3 more lines at this price File of Apr 1, 2026 · source file | $67.00 | $67.00 | — | — |
| Northshore University Healthsystem - Evanston Hospital Evanston, IL · (847) 570-2000 HB POTASSIUM * (P)+3 more lines at this price File of Apr 1, 2026 · source file | $67.00 | $67.00 | — | — |
| Swedish Covenant Health Chicago, IL · (773) 878-8200 HB POTASSIUM, WHOLE BLOOD*+3 more lines at this price File of Apr 1, 2026 · source file | $67.00 | $67.00 | — | — |
| Franciscan Health Munster Munster, IN · (219) 922-4200 Assay of Serum Potassium-Oh source file | $67.52 | $317.00 | $3.76–$237.75 | 79% |
| Northwest Community Hospital Arlington Heights, IL · (847) 618-1000 Hb Potassium, Whole Blood Poct+1 more line at this price File of Apr 1, 2026 · source file | $69.00 | $69.00 | — | — |
| Northwestern Medicine Valley West Hospital Sandwich, IL · (815) 786-8484 HB Potassium Level File of Apr 1, 2026 · source file | $74.20 | $106.00 | $20.14–$106.00 | 30% |
| Northwestern Medicine McHenry Hospital McHenry, IL · (815) 344-5000 HB Potassium Level File of Apr 1, 2026 · source file | $76.30 | $109.00 | $21.04–$109.00 | 30% |
| Northwestern Lake Forest Hospital Lake Forest, IL · (847) 234-5600 HB Potassium Level File of Apr 1, 2026 · source file | $76.30 | $109.00 | $18.09–$109.00 | 30% |
| Franciscan Health Crown Point Crown Point, IN · (219) 757-6100 Assay of Serum Potassium-Oh source file | $81.79 | $317.00 | $317.00 | 74% |
| Northwestern Medicine Central DuPage Hospital Winfield, IL · (630) 682-1600 HB Ref Potassium Serum Plasma/Whole Blood (Q) File of Apr 1, 2026 · source file | $82.60 | $118.00 | $8.14–$118.00 | 30% |
| Northwestern Memorial Hospital Chicago, IL · (312) 926-2000 HB Ref Potassium Serum Plasma/Whole Blood (Q) File of Apr 1, 2026 · source file | $82.60 | $118.00 | $14.51–$118.00 | 30% |
| Northwestern Medicine Delnor Hospital Geneva, IL · (630) 208-3000 HB Ref Potassium Serum Plasma/Whole Blood (Q) File of Apr 1, 2026 · source file | $82.60 | $118.00 | $17.58–$118.00 | 30% |
| Elmhurst Memorial Hospital Elmhurst, IL · (331) 221-1000 HC POTASSIUM SERUM PLASMA OR WHOLE BLOOD File of Apr 1, 2026 · source file | $96.00 | $96.00 | — | — |
| Edward Hospital Naperville, IL · (630) 527-3000 HC POTASSIUM SERUM PLASMA OR WHOLE BLOOD File of Apr 1, 2026 · source file | $96.00 | $96.00 | — | — |
| Northwestern Memorial Hospital Chicago, IL · (312) 926-2000 HB Potassium Level File of Apr 1, 2026 · source file | $100.10 | $143.00 | $13.81–$143.00 | 30% |
| Northwestern Medicine Central DuPage Hospital Winfield, IL · (630) 682-1600 HB Potassium Level File of Apr 1, 2026 · source file | $100.10 | $143.00 | $9.87–$143.00 | 30% |
| Franciscan Health Rensselaer Rensselaer, IN · (219) 866-5141 Assay of Serum Potassium-Oh source file | $113.49 | $317.00 | $4.26–$253.60 | 64% |
| Jackson Park Hospital Foundation Chicago, IL · (773) 947-7500 POTASSIUM SERUM source file | $117.88 | $147.35 | — | 20% |
| Ingalls Memorial Hospital Harvey, IL · (708) 333-2300 Hc Potassium; Serum, Plasma Or Whole Blood File of Apr 1, 2026 · source file | $129.00 | $129.00 | — | — |
| Uchicago Medicine Northwest Indiana Crown Point, IN · (312) 755-4706 HC POTASSIUM; SERUM, PLASMA OR WHOLE BLOOD File of Apr 1, 2026 · source file | $129.00 | $129.00 | — | — |
| Vista Medical Center East Waukegan, IL · (847) 360-3000 POTASSIUM SER PL WB source file | $149.64 | $149.64 | $0.01–$21.10 | — |
Hospital The hospital that published the price, its city and the line exactly as written in its price file.
Cash price The hospital's own price for a patient paying without insurance (“discounted cash” in its price file). Hospitals must publish it under federal law, 45 CFR 180.50. Call to confirm it before booking. More
List price The hospital's full chargemaster price (“gross charge”) before any discount. Almost nobody pays it; the gap to the cash price shows what the self-pay discount is worth. More
Insurers pay The lowest and highest rates this hospital has agreed with insurance plans for the same item, from its price file. If the cash price is below what your plan pays and you have not met your deductible, paying cash can cost you less. More
Off list How much lower the cash price is than the list price.
No cash discount This line's cash price equals the hospital's full list price. Many hospitals still reduce bills for uninsured patients: ask the billing office for its self-pay discount in writing. More
Outpatient: lowest $4.00, median $28.64, highest $149.64 — a 37.4× difference within the same market.
As an inpatient, the same code is billed by 40 facilities here, median $27.50. Inpatient and outpatient prices are not comparable and are kept on separate pages: the inpatient charge covers admission, not the same purchase.
Cash or insurance?
At 41 of 46 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at 3 it is below every plan's rate. If you have insurance but have not met your deductible, you usually pay your plan's negotiated rate, which falls somewhere in the "Insurers pay" column. Paying cash can cost less, but a cash payment usually does not count toward your deductible. Ask the hospital for both numbers before you book.
What it is
A potassium test measures the level of potassium in the blood. Doctors check it for people on diuretics or blood pressure drugs, with kidney disease, an irregular heartbeat, or vomiting and diarrhea.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.
2 rows held back from this comparison
They are priced below $1 or below a tenth of the national median for code 84132 ($37.50). Such a line is almost always a physician's fee billed separately, an assistant's share or a placeholder — a real charge, but not the price of the procedure itself.
| Hospital | Cash price | File |
|---|---|---|
| Loyola University Medical Center Maywood, ILEwc - Lab Potassium | $0.01 | file |
| Gottlieb Memorial Hospital Melrose Park, ILEwc - Lab Potassium | $0.01 | file |
File Link to the hospital's own price file.