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Follicle-Stimulating Hormone (FSH) and Creatinine, 24-Hour Urine

Published: August 9, 2026Updated: August 16, 2026

Measures follicle-stimulating hormone and creatinine in a 24-hour urine collection. Creatinine can help evaluate daily excretion and whether the collection appears complete.

Quick summary

["This test measures daily urinary FSH and creatinine, with creatinine helping assess collection adequacy and kidney excretion."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
44356-4
Short code
FSH/Creat 24h Ur
Synonyms
FSH/Creat 24h Ur
Category
kidney
Sample
urine
Container
Sterile urine container
Units
N/A
Ref low
3.5
Ref high
12.5
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
83001
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What is this test?

This test measures follicle-stimulating hormone (FSH) and creatinine in urine collected for 24 hours. FSH is a hormone involved in reproductive function, while creatinine is a waste product produced by muscle and filtered by the kidneys.

Why might I need this test?

A 24-hour urine collection can show how much of a substance is excreted over a full day. The clinician may use FSH to evaluate hormonal activity and creatinine to help assess kidney excretion, muscle contribution, hydration, and collection completeness.

How is the test performed?

All urine produced during a complete 24-hour period is collected in a labeled container and sent to the laboratory for measurement. The collection should include urine from the start of one day through the end of the next day.

How do I prepare for the test?

Follow the laboratory's 24-hour collection instructions, including the exact start and stop times. Usually, the first morning urine is discarded and all later urine is collected, with the final specimen added at the end of the collection period.

Reference range

Follicular: 3.5-12.5 mIU/mLN/A

Specimen: urine

For females: inform if menstrual cycle status. For certain tests, timing within menstrual cycle may matter.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

24-Hour Urine FSH and Creatinine

Frequently asked questions

Do I need to be awake during the 24-hour collection?
No. You can carry out normal activities and sleep as usual, but you must collect all urine during the specified period according to the laboratory's instructions.
What if I miss part of the collection?
Tell the laboratory or your clinician because a missed specimen can make the daily measurement inaccurate. The collection may need to be repeated.
Why is creatinine included with the FSH measurement?
Creatinine provides information about daily urine output and can help determine whether the collection is complete. It also reflects muscle metabolism and kidney handling of creatinine.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy