Magnesium test cost in Washington, DC
In Washington-Arlington-Alexandria, DC-VA-MD-WV, 7 hospitals list a cash price for Magnesium blood test: from $6.50 to $78.00, with a median of $78.00. The lowest listed price is at Potomac Hospital Corporation of Prince William — $71.50 less than the median here.
Cash prices at 7 facilities across 6 cities for code 83735, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 23, 2026; the hospital files themselves were last updated between Apr 1, 2026 and Apr 1, 2026.
Where each hospital's price falls
Each dot is one hospital's cash price on a scale from the lowest to the highest in Washington-Arlington-Alexandria, DC-VA-MD-WV.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Potomac Hospital Corporation of Prince William lowest Woodbridge, VA Chgl (Qu) Magnesium, Rbc, S/O | $6.50 | $13.00 | — | 50% | Apr 1, 2026 source file |
| Potomac Hospital Corporation of Prince William Woodbridge, VA Chgl (Qu) Magnesium, 24 Hour Urine, (W/O Creatinine), Aa, S/O | $9.50 | $19.00 | — | 50% | Apr 1, 2026 source file |
| Jefferson Medical Center Ranson, WV ASSAY OF MAGNESIUM | $13.50 | $27.00 | — | 50% | — source file |
| Inova Alexandria Hospital Alexandria, VA HC MAGNESIUM, URINE | $78.00 | $156.00 | $6.47–$121.68 | 50% | — source file |
| Inova Fair Oaks Hospital Fairfax, VA HC MAGNESIUM, URINE | $78.00 | $156.00 | $6.47–$121.68 | 50% | — source file |
| Inova Fair Oaks Hospital Fairfax, VA HC MAGNESIUM, STOOL | $78.00 | $156.00 | $6.47–$121.68 | 50% | — source file |
| Inova Fair Oaks Hospital Fairfax, VA HC MAGNESIUM | $78.00 | $156.00 | $6.47–$121.68 | 50% | — source file |
| Inova Fairfax Hospital Falls Church, VA HC MAGNESIUM, URINE | $78.00 | $156.00 | $6.47–$121.68 | 50% | — source file |
| Inova Fairfax Hospital Falls Church, VA HC MAGNESIUM, STOOL | $78.00 | $156.00 | $6.47–$121.68 | 50% | — source file |
| Inova Fairfax Hospital Falls Church, VA HC MAGNESIUM | $78.00 | $156.00 | $6.47–$121.68 | 50% | — source file |
| Inova Loudoun Hospital Leesburg, VA HC MAGNESIUM, URINE | $78.00 | $156.00 | $6.47–$121.68 | 50% | — source file |
| Inova Loudoun Hospital Leesburg, VA HC MAGNESIUM, STOOL | $78.00 | $156.00 | $6.47–$121.68 | 50% | — source file |
| Inova Loudoun Hospital Leesburg, VA HC MAGNESIUM | $78.00 | $156.00 | $6.47–$121.68 | 50% | — source file |
| Inova Mount Vernon Hospital Alexandria, VA HC MAGNESIUM, URINE | $78.00 | $156.00 | $6.47–$121.68 | 50% | — source file |
| Inova Mount Vernon Hospital Alexandria, VA HC MAGNESIUM, STOOL | $78.00 | $156.00 | $6.47–$121.68 | 50% | — source file |
| Inova Mount Vernon Hospital Alexandria, VA HC MAGNESIUM | $78.00 | $156.00 | $6.47–$121.68 | 50% | — source file |
| Inova Alexandria Hospital Alexandria, VA HC MAGNESIUM, STOOL | $78.00 | $156.00 | $6.47–$121.68 | 50% | — source file |
| Inova Alexandria Hospital Alexandria, VA HC MAGNESIUM | $78.00 | $156.00 | $6.47–$121.68 | 50% | — source file |
| Potomac Hospital Corporation of Prince William Woodbridge, VA Chgl Magnesium Urine | $83.50 | $167.00 | — | 50% | Apr 1, 2026 source file |
| Potomac Hospital Corporation of Prince William Woodbridge, VA Chgl Magnesium Serum | $83.50 | $167.00 | — | 50% | Apr 1, 2026 source file |
| Potomac Hospital Corporation of Prince William Woodbridge, VA Chgl Magnesium,Rbc | $83.50 | $167.00 | — | 50% | Apr 1, 2026 source file |
| Potomac Hospital Corporation of Prince William Woodbridge, VA Chgl Magnesium,Urine (Ks Panel) | $83.50 | $167.00 | — | 50% | Apr 1, 2026 source file |
Outpatient: lowest $6.50, median $78.00, highest $78.00 — a 12.0× difference within the same market.
As an inpatient, the same code is billed by 6 facilities here, median $78.00. 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 5 of 5 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at none is it 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 magnesium test measures the level of magnesium in the blood. Doctors order it for muscle cramps or weakness, an irregular heartbeat, low potassium or calcium that does not correct, and for people on diuretics, long-term acid-reducing drugs or with kidney disease.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.
1 row held back from this comparison
It is priced below $1 or below a tenth of the national median for code 83735 ($43.50). 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.
| Potomac Hospital Corporation of Prince William Woodbridge, VAChgl (Qu) 83735 Stonerisk? Diagnostic Profile, S/O | $4.00 | file |