Ammonia blood test cost in Saint Louis, MO

Prices at 6 hospitals in Saint Louis, MO, from their machine-readable files. Here the median cash price is $83 — 7% below the US median ($90), roughly 5.7× the Medicare rate.

Lowest cash prices

HospitalLocationCashInsurerCMS ratingER waitReadmit
St Louis Childrens Hospital Saint Louis, MO $47 $56
Missouri Baptist Medical Center Saint Louis, MO $62 $35 ★ 5/5 262 min
Christian Hospital Northeast Saint Louis, MO $62 $50 ★ 4/5 217 min
Mercy Hospital South Saint Louis, MO $104 $19 ★ 2/5 254 min
Mercy Hospital St Louis Saint Louis, MO $118 $19 ★ 4/5 220 min
Shriners Hospitals for Children Saint Louis, MO $152 $19

CMS rating = overall hospital star rating (1–5); ER wait = median minutes in the emergency department; Readmit = 30-day readmission rate (lower is better) — all from Medicare’s Care Compare; “—” = not reported. Data last updated September 2026. Prices from hospitals’ machine-readable files (45 CFR §180); Medicare benchmark from CMS PFS/CLFS/IPPS. Prices below 15% of the median are excluded as likely partial or mis-coded charges. Estimates — confirm with the hospital. Report an incorrect price.

Price comparison (median)

Chargemaster (list price)
$127
Cash / self-pay
$83
Insurer-negotiated
$27
Medicare pays
$15
$55$135
Median cash $83  ·  Medicare $15  ·  bar = typical cash range (10th–90th percentile)
Is this a fair price?
1× Medicarefair ≈2×5×+

Typical cash price here is $83 — about 5.7× the Medicare rate ($15). High vs Medicare. A fair cash price is usually within ~2× Medicare ($29).

💡 Asking for the cash price instead of the $127 list price could save about $44 (35%).

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Rough estimate from this procedure’s median insurer-negotiated rate. Your actual cost depends on your plan — confirm with your insurer.

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