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Procedure price report · Laboratory - Chemistry and Hematology

Fetal lung maturity test, lecithin-sphingomyelin ratio

CPT 83661the billing code this page is about

Measures the ratio of two fats in amniotic fluid to assess how developed a fetus's lungs are.

Hospitals typically charge $142 cash for this outpatient procedure — the median across 999 hospitals that filed a usable cash price; the average of the middle 60% is $147. Most fall between $50 and $276 (20th–80th percentile).

Hospitals
999
States
48
Filings dated
Dec 2022 – Sep 2026
Computed
September 25, 2026
Prices checked
through September 24, 2026

Median: half of hospitals filed less, half more — and it is a price some hospital actually filed. Average of the middle 60%: the mean of the prices between the 20th and 80th percentiles. We never publish the plain average, the lowest or the highest price: the extremes in hospital price files are chargemaster artefacts, not prices anyone pays.

What hospitals charge, from cheapest to most expensive

Cash price percentiles, outpatient, across 999 hospitals. Each figure is a price a hospital filed. 10th: one in ten hospitals charges less; 25th: a quarter charge less; Median: half charge less; 75th: three quarters charge less; 90th: nine in ten charge less.
10th25thMedian75th90th
$27$57$142$245$428

The most expensive tenth of hospitals charges at least 16× what the cheapest tenth charges ($27 vs $428).

How the prices are spread

$22 – $32: 77 hospitals$22$32 – $46: 63 hospitals$46 – $67: 83 hospitals$46$67 – $97: 126 hospitals$97 – $140: 105 hospitals$97$140 – $203: 159 hospitals$203 – $294: 157 hospitals$203$294 – $426: 82 hospitals$426 – $618: 26 hospitals$426$618 – $895: 27 hospitals$618median $142price bands are equal on a log scale
Hospitals per price band (905 of 999 — the bands cover the 5th to 95th percentile)
FromToHospitals
$22$3277
$32$4663
$46$6783
$67$97126
$97$140105
$140$203159
$203$294157
$294$42682
$426$61826
$618$89527

By state

The median cash price in each state, against the national median of $142.

Alaska: 6 hospitals filed a usable price — fewer than 10, so no figureAKMaine: 5 hospitals filed a usable price — fewer than 10, so no figureMEVermont: no hospital in the corpus filed a usable priceVTNew Hampshire: 2 hospitals filed a usable price — fewer than 10, so no figureNHWashington: median $55 across 15 hospitalsWA$55Idaho: 3 hospitals filed a usable price — fewer than 10, so no figureIDMontana: 4 hospitals filed a usable price — fewer than 10, so no figureMTNorth Dakota: 4 hospitals filed a usable price — fewer than 10, so no figureNDMinnesota: 4 hospitals filed a usable price — fewer than 10, so no figureMNIllinois: median $275 across 51 hospitalsIL$275Wisconsin: 3 hospitals filed a usable price — fewer than 10, so no figureWIMichigan: median $49 across 25 hospitalsMI$49New York: median $83 across 45 hospitalsNY$83Massachusetts: median $91 across 10 hospitalsMA$91Oregon: median $111 across 12 hospitalsOR$111Nevada: 7 hospitals filed a usable price — fewer than 10, so no figureNVWyoming: 4 hospitals filed a usable price — fewer than 10, so no figureWYSouth Dakota: 1 hospital filed a usable price — fewer than 10, so no figureSDIowa: median $55 across 20 hospitalsIA$55Indiana: median $112 across 45 hospitalsIN$112Ohio: median $184 across 47 hospitalsOH$184Pennsylvania: median $80 across 56 hospitalsPA$80New Jersey: median $24 across 31 hospitalsNJ$24Connecticut: 9 hospitals filed a usable price — fewer than 10, so no figureCTRhode Island: 2 hospitals filed a usable price — fewer than 10, so no figureRICalifornia: median $178 across 67 hospitalsCA$178Utah: 6 hospitals filed a usable price — fewer than 10, so no figureUTColorado: median $77 across 18 hospitalsCO$77Nebraska: median $306 across 14 hospitalsNE$306Missouri: median $191 across 38 hospitalsMO$191Kentucky: median $153 across 24 hospitalsKY$153West Virginia: 9 hospitals filed a usable price — fewer than 10, so no figureWVVirginia: median $121 across 17 hospitalsVA$121Maryland: median $257 across 19 hospitalsMD$257Delaware: no hospital in the corpus filed a usable priceDEArizona: median $158 across 21 hospitalsAZ$158New Mexico: 4 hospitals filed a usable price — fewer than 10, so no figureNMKansas: median $162 across 18 hospitalsKS$162Arkansas: median $150 across 13 hospitalsAR$150Tennessee: median $77 across 25 hospitalsTN$77North Carolina: median $158 across 25 hospitalsNC$158South Carolina: median $112 across 13 hospitalsSC$112Oklahoma: median $147 across 32 hospitalsOK$147Louisiana: median $51 across 17 hospitalsLA$51Mississippi: median $89 across 22 hospitalsMS$89Alabama: median $92 across 13 hospitalsAL$92Georgia: median $123 across 31 hospitalsGA$123Hawaii: 3 hospitals filed a usable price — fewer than 10, so no figureHITexas: median $251 across 99 hospitalsTX$251Florida: median $32 across 40 hospitalsFL$32
Cash price by state, most expensive first. National median $142. A state needs at least 10 hospitals with a usable price to show a figure.
StateHospitalsMedianvs national20th–80th
Nebraska NE14$306+115%$145 – $353
Illinois IL51$275+94%$105 – $477
Maryland MD19$257+81%$138 – $372
Texas TX99$251+77%$81 – $1,256
Missouri MO38$191+35%$68 – $228
Ohio OH47$184+29%$92 – $377
California CA67$178+26%$55 – $225
Kansas KS18$162+14%$90 – $214
North Carolina NC25$158+11%$37 – $245
Arizona AZ21$158+11%$87 – $172
Kentucky KY24$153+8%$82 – $276
Arkansas AR13$150+5%$73 – $174
Oklahoma OK32$147+4%$62 – $215
Georgia GA31$123−13%$45 – $206
Virginia VA17$121−15%$73 – $199
Indiana IN45$112−21%$47 – $237
South Carolina SC13$112−21%$94 – $498
Oregon OR12$111−22%$96 – $161
Alabama AL13$92−35%$27 – $201
Massachusetts MA10$91−36%$54 – $114
Mississippi MS22$89−37%$69 – $182
New York NY45$83−41%$22 – $198
Pennsylvania PA56$80−44%$21 – $267
Colorado CO18$77−46%$57 – $2,946
Tennessee TN25$77−46%$39 – $215
Iowa IA20$55−61%$55 – $112
Washington WA15$55−62%$38 – $183
Louisiana LA17$51−64%$32 – $119
Michigan MI25$49−66%$29 – $79
Florida FL40$32−77%$20 – $168
New Jersey NJ31$24−83%$22 – $25
Connecticut CT9not enough hospitals filed a usable price
West Virginia WV9not enough hospitals filed a usable price
Nevada NV7not enough hospitals filed a usable price
Alaska AK6not enough hospitals filed a usable price
Utah UT6not enough hospitals filed a usable price
Maine ME5not enough hospitals filed a usable price
Minnesota MN4not enough hospitals filed a usable price
Montana MT4not enough hospitals filed a usable price
North Dakota ND4not enough hospitals filed a usable price
New Mexico NM4not enough hospitals filed a usable price
Wyoming WY4not enough hospitals filed a usable price
Hawaii HI3not enough hospitals filed a usable price
Idaho ID3not enough hospitals filed a usable price
Wisconsin WI3not enough hospitals filed a usable price
New Hampshire NH2not enough hospitals filed a usable price
Rhode Island RI2not enough hospitals filed a usable price
South Dakota SD1not enough hospitals filed a usable price

Hospitals like yours

The same distribution cut by the kind of hospital. Hospital type and ownership come from CMS; a hospital counts as part of a system when its price file is shared with at least one other hospital under the same brand. The national median is $142.

Cash price by hospital segment. A segment needs at least 20 hospitals to show a figure.
SegmentHospitalsMedian20th–80th
Hospital type
Acute care812$136$45 – $276
Children’s9fewer than 20 hospitals
Critical access173$161$87 – $272
Ownership
For-profit177$208$55 – $996
Government114$105$35 – $211
Non-profit703$138$50 – $254
System affiliation
Part of a system835$151$49 – $285
Independent164$125$61 – $209

Cash price vs list price

Median list price (chargemaster)$255
Median cash price$142
Cash as a share of list, median hospital60%

At the typical hospital, asking for the cash price cuts the list price by about 40%. The share is the median of each hospital’s own cash ÷ list ratio, over hospitals that filed both — not the ratio of the two medians above.

The same procedure, inpatient

617 hospitals filed a usable inpatient cash price for this code. The median is $147 and the average of the middle 60% is $152; most fall between $58 and $262.

Cash price percentiles, inpatient, across 617 hospitals. Each figure is a price a hospital filed. 10th: one in ten hospitals charges less; 25th: a quarter charge less; Median: half charge less; 75th: three quarters charge less; 90th: nine in ten charge less.
10th25thMedian75th90th
$45$77$147$242$377

The most expensive tenth of hospitals charges at least 8.4× what the cheapest tenth charges ($45 vs $377).

Of the 691 hospitals that filed this code inpatient, 617 gave a usable cash price; 27 carried a plausibility flag, 0 filed a number their own filing marks as not a price, 0 gave an estimate, and 47 a list price only.

How complete is this

999 of the 3,956 hospitals with a price file in our corpus (25%) filed a usable outpatient cash price for this code, and those are the hospitals every figure on this page is computed from.

What the 1,097 hospitals that filed this code at all gave us
Usable cash price — counted999
Cash price carrying a plausibility flag — shown on the compare tool, excluded here46
A number the filing itself marks as not a price (a placeholder, a ratio) — excluded0
An estimate rather than a filed cash price — excluded0
A list price only, no cash figure — excluded52
Hospitals that filed this code1,097

Sections not shown for this setting

  • Against Medicare: Medicare has no separately payable national outpatient (OPPS) rate for this code, so there is nothing honest to compare against.
  • Since our last snapshot: there is no earlier snapshot at least 90 days older than this one yet.

We last checked these hospitals’ price files for changes between July 20, 2026 and September 24, 2026; the figures were computed September 25, 2026 from filings loaded through September 24, 2026. The percentiles and averages use only the “counted” row.

Related procedures

Part of the Laboratory - Chemistry and Hematology family.

Hospitals file this code under descriptions such as Hc Assay L/S Ratio.

Method

Source
The machine-readable price files every U.S. hospital is required by CMS to publish, parsed per hospital. Nothing is surveyed, sampled or modelled.
What counts
One cash (self-pay) price per hospital for this code and setting. A hospital’s own filing can rule its number out — a placeholder, a “not applicable” note, a list price standing in for cash — and our plausibility checks can flag a price far below what every other hospital files. Both kinds are disclosed above and excluded from the statistics; on the compare tool a flagged price is still shown.
Statistics
Percentiles are discrete: each is a price some hospital filed. The average is the mean of the prices between the 20th and 80th percentiles. We never publish the plain mean, the minimum or the maximum. A state needs 10 hospitals and a segment 20 to show a figure; otherwise the row shows its count and no number. Medicare is the national unadjusted OPPS rate where one exists.
Names
Procedure names on these pages are our own plain-language titles, not the AMA’s copyrighted CPT descriptors. The code is the identity.

The full rules — sources, statistics, thresholds, limitations — are on the methodology page.

Download this page’s figures: JSON · CSV. Aggregates only — the per-hospital prices are on the compare tool.

Cite: HospitalRates.com, “Fetal lung maturity test, lecithin-sphingomyelin ratio (CPT 83661) — cash price report,” computed September 25, 2026. https://hospitalrates.com/procedures/cpt-83661-fetal-lung-maturity-test-lecithin-sphingomyelin-ratio