Template:Repeat B-hCG levels: Difference between revisions
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===Repeat [[B-hCG]] Levels===
===Repeat [[Beta-HCG|B-hCG]] Levels===
{| {{table}}
{| {{table}}
| align="center" style="background:#f0f0f0;"|'''Pregnancy Type'''
| align="center" style="background:#f0f0f0;"|'''Pregnancy Type'''
| align="center" style="background:#f0f0f0;"|'''B-hCG Change'''
| align="center" style="background:#f0f0f0;"|'''B-hCG Change'''
|-
|-
| Normal||Increase >53% in 48hrs (until 10,000 mIU/ml)
| [[Pregnancy (main)|Normal]]||
(This increase depends on the initial value. <1500 --> 50% inc, 1500-3000 --> 40% inc, > 3000 --> 30% inc)
*Minimum expected rise depends on initial hCG value:<ref name="barnhart2004">Barnhart KT, Sammel MD, Rinaudo PF, et al. Symptomatic patients with an early viable intrauterine pregnancy: HCG curves redefined. Obstet Gynecol. 2004; 104(1):50-55. PMID 15229000.</ref><ref name="barnhart2016">Barnhart KT, Guo W, Cary MS, et al. Differences in serum human chorionic gonadotropin rise in early pregnancy by race and value at presentation. Obstet Gynecol. 2016; 128(3):504-511. PMID 27500347.</ref>
**Initial hCG <1,500 mIU/mL: minimum 49% rise in 48hrs
**Initial hCG 1,500-3,000 mIU/mL: minimum 40% rise in 48hrs
**Initial hCG >3,000 mIU/mL: minimum 33% rise in 48hrs
*hCG typically doubles approximately every 48-72 hours in early pregnancy
*Rate of rise slows after hCG reaches approximately 6,000-10,000 mIU/mL
|-
|-
| Ectopic||Increases or decreases slowly ("plateau")^
| [[Ectopic pregnancy|Ectopic]]||
*Increases or decreases more slowly than expected ("plateau")
*Approximately 21% of ectopic pregnancies have a normal hCG rise<ref name="silva2006">Silva C, Sammel MD, Zhou L, et al. Human chorionic gonadotropin profile for women with ectopic pregnancy. Obstet Gynecol. 2006; 107(3):605-610. PMID 16507930.</ref>
|-
|-
| Miscarriage||Decreases >20% in 48 hrs
| [[Miscarriage]]||
*Expected to decline >21-35% in 48 hrs<ref name="doubilet2013">Doubilet PM, Benson CB, Bourne T, Blaivas M. Diagnostic criteria for nonviable pregnancy early in the first trimester. N Engl J Med. 2013; 369(15):1443-1451. PMID 24106937.</ref>
|}
|}
^Initial level CANNOT be used to rule-out ectopic
*A single hCG level '''cannot''' reliably distinguish intrauterine from [[ectopic pregnancy]]<ref name="murray2005">Murray H, Baakdah H, Bardell T, Tulandi T. Diagnosis and treatment of ectopic pregnancy. CMAJ. 2005; 173(8):905-912. PMID 16217116.</ref>
*The [[Ectopic pregnancy|discriminatory zone]] (typically 1,500-3,500 mIU/mL depending on institution) is the hCG level above which a gestational sac should be visible on transvaginal ultrasound<ref name="connolly2013">Connolly A, Ryan DH, Stuber AR, Postma HJ. Reevaluation of discriminatory and threshold levels for serum beta-hCG in early pregnancy. Obstet Gynecol. 2013; 121(1):65-70. PMID 23262929.</ref>

Latest revision as of 06:33, 22 March 2026

Repeat B-hCG Levels

Pregnancy Type B-hCG Change
Normal
  • Minimum expected rise depends on initial hCG value:[1][2]
    • Initial hCG <1,500 mIU/mL: minimum 49% rise in 48hrs
    • Initial hCG 1,500-3,000 mIU/mL: minimum 40% rise in 48hrs
    • Initial hCG >3,000 mIU/mL: minimum 33% rise in 48hrs
  • hCG typically doubles approximately every 48-72 hours in early pregnancy
  • Rate of rise slows after hCG reaches approximately 6,000-10,000 mIU/mL
Ectopic
  • Increases or decreases more slowly than expected ("plateau")
  • Approximately 21% of ectopic pregnancies have a normal hCG rise[3]
Miscarriage
  • Expected to decline >21-35% in 48 hrs[4]
  • A single hCG level cannot reliably distinguish intrauterine from ectopic pregnancy[5]
  • The discriminatory zone (typically 1,500-3,500 mIU/mL depending on institution) is the hCG level above which a gestational sac should be visible on transvaginal ultrasound[6]
  1. ↑ Barnhart KT, Sammel MD, Rinaudo PF, et al. Symptomatic patients with an early viable intrauterine pregnancy: HCG curves redefined. Obstet Gynecol. 2004; 104(1):50-55. PMID 15229000.
  2. ↑ Barnhart KT, Guo W, Cary MS, et al. Differences in serum human chorionic gonadotropin rise in early pregnancy by race and value at presentation. Obstet Gynecol. 2016; 128(3):504-511. PMID 27500347.
  3. ↑ Silva C, Sammel MD, Zhou L, et al. Human chorionic gonadotropin profile for women with ectopic pregnancy. Obstet Gynecol. 2006; 107(3):605-610. PMID 16507930.
  4. ↑ Doubilet PM, Benson CB, Bourne T, Blaivas M. Diagnostic criteria for nonviable pregnancy early in the first trimester. N Engl J Med. 2013; 369(15):1443-1451. PMID 24106937.
  5. ↑ Murray H, Baakdah H, Bardell T, Tulandi T. Diagnosis and treatment of ectopic pregnancy. CMAJ. 2005; 173(8):905-912. PMID 16217116.
  6. ↑ Connolly A, Ryan DH, Stuber AR, Postma HJ. Reevaluation of discriminatory and threshold levels for serum beta-hCG in early pregnancy. Obstet Gynecol. 2013; 121(1):65-70. PMID 23262929.
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