Ferning of amniotic fluid

(A) Typical ferning pattern of dried amniotic fluid (400).
(B, C) Urine and amniotic fluid can be distinguished by microscopic examination of a droplet of the fluid spread and dried on a microscope slide. The proteins in amniotic fluid give the appearance of ferning (B) that is not observed with urine (C).
(D) Ferning pattern from amniotic fluid.

Reproduced with permission from:
(A) Courtesy of Dr. Dwight Rouse.
(B) McClatchey KD. Clinical Laboratory Medicine, 2nd Edition. Philadelphia: Lippincott Williams & Wilkins, 2002.
(C) McClatchey KD. Clinical Laboratory Medicine, 2nd Edition. Philadelphia: Lippincott Williams & Wilkins, 2002.
(D) Beckmann CRB, Ling FW, Smith RP, et al. Obstetrics and Gynecology, 5th Edition. Philadelphia: Lippincott Williams & Wilkins, 2006.

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Ferning of amniotic fluid