# Microhematuria

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**Microhematuria**, also called **microscopic hematuria** (both usually abbreviated as **MH**), is a medical condition in which [urine](/source/Urine) contains small amounts of [blood](/source/Blood); the blood quantity is too low to change the color of the urine (otherwise, it is known as gross [hematuria](/source/Hematuria)). While not dangerous in itself, it may be a symptom of kidney disease, such as [IgA nephropathy](/source/IgA_nephropathy) or [sickle cell trait](/source/Sickle_cell_trait),[1] or bladder pathology which should be monitored by a doctor.

The [American Urological Association](/source/American_Urological_Association) (AUA) recommends a definition of microscopic hematuria as three or more red blood cells per high-power microscopic field in urinary sediment from two of three properly collected urinalysis specimens.[2]

Microhematuria is usually [asymptomatic](/source/Asymptomatic), and as of 2001 there were [medical guidelines](/source/Medical_guideline) on how to handle *asymptomatic microhematuria* (*AMH*) so as to avoid problems such as overtreatment or misdiagnosis.[2] In 2025, American Urological Association guidelines for microhematuria were updated.[3]

## See also

- [Proteinuria](/source/Proteinuria)
- [Hematuria](/source/Hematuria)
- [Myoglobinuria](/source/Myoglobinuria)
- [Hemoglobinuria](/source/Hemoglobinuria)

## References

1. ["Sickle Cell trait and Hematuria: Information for healthcare providers"](https://www.cdc.gov/ncbddd/sicklecell/documents/fs_hematuria_provider_b.pdf). *cdc.gov*. Center for Disease Control and Prevention. Retrieved 3 July 2020.

1. Grossfeld, G.; Wolf Jr, J.; Litwan, M.; Hricak, H.; Shuler, C.; Agerter, D.; Carroll, P. (March 15, 2001). ["Asymptomatic microscopic hematuria in adults: Summary of the AUA best practice policy recommendations"](http://www.aafp.org/afp/2001/0315/p1145.html). *American Family Physician*. **63** (6): 1145–1154. [PMID 11277551](https://pubmed.ncbi.nlm.nih.gov/11277551)

1. ["Microhematuria: AUA/SUFU Guideline (2025)"](https://www.auanet.org/guidelines-and-quality/guidelines/microhematuria). *www.auanet.org*. 2025. Retrieved 2025-08-06.

## External links

- Cohen RA, Brown RS (2003). "Clinical practice. Microscopic hematuria". *N. Engl. J. Med.*. **348** (23): 2330–8. [doi:10.1056/NEJMcp012694](https://doi.org/10.1056/NEJMcp012694). [PMID 12788998](https://pubmed.ncbi.nlm.nih.gov/12788998)
- 2012 AUA Guidelines [\[1\]](https://web.archive.org/web/20121224195755/http://www.auanet.org/content/media/asymptomatic_microhematuria_guideline.pdf)

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