Creatinine is a fairly reliable indicator of a person's kidney functioning.
"His condition is hemodynamically stable. He had homemade food in the morning. In due course of time he will undergo different tests. He has urine infection," a senior doctor with AIIMS said.
Arrested for his alleged role in the 2008 cash-for-votes scam, Singh, 55, was admitted in the private ward of AIIMS at around 8 pm on Monday night, Tihar jail spokesman Sunil Gupta said. Singh is now admitted in the new private ward of the hospital.
"He will undergo different tests which will include those related to blood, ultrasound and chest X-ray. Dr Sanjay Gupta, additional professor, department of Nephrology is looking into his case as he is a post transplant case. Gastroenterologists and endocrinologists will also be roped in," the doctor said.
Singh was shifted to AIIMS after a panel of doctors at Tihar jail found his creatinine level high.
The former Samajwadi Party General Secretary has been in Tihar Jail since his arrest on September 6 in connection with the cash-for-vote scam.