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Renal Insufficiency in Pregnancy

By

Lara A. Friel

, MD, PhD, University of Texas Health Medical School at Houston, McGovern Medical School

Reviewed/Revised Sep 2023
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Renal disorders often do not worsen during pregnancy; noninfectious renal disorders are usually exacerbated only when uncontrolled hypertension coexists. However, significant renal insufficiency (serum creatinine > 3 mg/dL [> 270 micromol/L] or blood urea nitrogen [BUN] > 30 mg/dL [> 10.5 mmol urea/L]) before pregnancy usually prevents women from maintaining a pregnancy to term.

Maternal renal insufficiency may cause

  • A transplanted kidney that has been in place for > 2 years

  • Normal renal function

  • No episodes of rejection

  • Normal blood pressure (BP)

Treatment of renal insufficiency during pregnancy requires close consultation with a nephrologist. BP and weight are measured every 2 weeks; BUN and creatinine levels plus creatinine clearance are measured often, at intervals dictated by severity and progression of disease. Furosemide is given only as needed to control BP or excessive edema; some women require other medications to control BP. Women with severe renal insufficiency may require hospitalization after 28 weeks gestation for bed rest, BP control, and close fetal monitoring. If results of antenatal testing remain normal and reassuring, the pregnancy continues.

Delivery is usually required before term because preeclampsia, fetal growth restriction, or uteroplacental insufficiency develop. Sometimes amniocentesis to check fetal lung maturity can help determine when delivery should be done; a lecithin/sphingomyelin ratio of > 2:1 or presence of phosphatidylglycerol indicates maturity. Cesarean delivery is very common, although vaginal delivery may be possible if the cervix is ripe and no impediments to vaginal delivery are evident.

End-stage renal disease

Advances in dialysis treatment have increased life expectancy for patients with end-stage renal disease, improved pregnancy outcomes, and increased fertility. The survival rate for fetuses of pregnant women receiving hemodialysis Hemodialysis In hemodialysis, a patient’s blood is pumped into a dialyzer containing 2 fluid compartments configured as bundles of hollow fiber capillary tubes or as parallel, sandwiched sheets of semipermeable... read more has improved from 23% (in about 1980) to almost 90% currently. The reason is probably the substantial increase in hemodialysis dose used during pregnancy; now, high-flux, high-efficiency hemodialysis is typically done 6 times a week. Dialysis can be adjusted based on laboratory, ultrasonographic, and clinical findings (eg, severe hypertension, nausea or vomiting, edema, excessive weight gain, persistent polyhydramnios).

Although pregnancy outcomes have improved, complication rates for patients with end-stage renal disease remain high.

Key Points

  • Women who have significant renal insufficiency before pregnancy usually cannot maintain a pregnancy to term.

  • In pregnant women with renal insufficiency, measure BP and weight every 2 weeks, and measure BUN and creatinine levels plus creatinine clearance often, as indicated by severity and progression of disease.

  • Consult closely with a nephrologist when treating renal insufficiency in a pregnant woman; delivery is usually required before term.

  • Advances in dialysis treatment have increased life expectancy for patients with end-stage renal disease, improved pregnancy outcomes, and increased fertility, but complication rates for these patients remain high.

Drugs Mentioned In This Article

Drug Name Select Trade
Aluvea , BP-50% Urea , BP-K50, Carmol, CEM-Urea, Cerovel, DermacinRx Urea, Epimide-50, Gord Urea, Gordons Urea, Hydro 35 , Hydro 40, Kerafoam, Kerafoam 42, Keralac, Keralac Nailstik, Keratol, Keratol Plus, Kerol, Kerol AD, Kerol ZX, Latrix, Mectalyte, Nutraplus, RE Urea 40, RE Urea 50 , Rea Lo, Remeven, RE-U40, RYNODERM , U40, U-Kera, Ultra Mide 25, Ultralytic-2, Umecta, Umecta Nail Film, URALISS, Uramaxin , Uramaxin GT, Urea, Ureacin-10, Ureacin-20, Urealac , Ureaphil, Uredeb, URE-K , Uremez-40, Ure-Na, Uresol, Utopic, Vanamide, Xurea, X-VIATE
Delone , FUROSCIX, Lasix
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NOTE: This is the Professional Version. CONSUMERS: View Consumer Version
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