Fig. 3

Serial hCG surveillance in 6 patients diagnosed with CSP. Day 1 represents the day of presentation and hospital admission. hCG serum levels were measured using the Immulite 1000 Immunoassay system (Siemens). The laboratory reference values for hCG (mUI/mL) were: non-pregnant, 1–10; week 1–2, 16–156; week 2–3, 101–4870; week 3–4, 1110–31,500; week 4–5, 2560–82,300; week 5–6, 23,100–151,000; week 6–7, 27,300–233,000; week 7–11, 20,900–291,000; week 11–16, 6140–103,000. CSP, caesarean scar pregnancy; hCG, hormone chorionic gonadotroph