A 28-year-old male farmer presents with fever for 5 days and petechiae, transferred from a rural hospital to Zhongshan Hospital of Shanghai Medical University in November 1993. Physical exam: temperature 38°C, BP 70/50 mmHg, marked facial and periorbital congestion, conjunctival edema and congestion, cord-like petechiae in the axilla, and significant renal tenderness. Suspected diagnosis: epidemic hemorrhagic fever. The patient has entered the hypotensive phase. Which of the following is NOT a typical laboratory finding in this phase?