Barrientos (Dr. Barrientos) of the Associated Medical and Clinical Services, Inc. for evaluation. In turn, she referred him to one of the urologists at the Makati Medical Center (MMC) for a consult and eventual management because his blood test results showed elevated BUN[10] and Creatinine levels and his urinalysis revealed an active infection.   From the 21st until the 26th of October 2002, Masangcay was hospitalized at the MMC for the treatment of his Non-Functional Right Kidney and Left Pelvolithiasis[11]; which included the following medical procedures:   Cystoscopy[12] Bilateral RGP Left Double J Stenting Left ESWL[13]   During one of Masangcays subsequent follow-ups, Dr. Francisco Agustin, Jr., his attending physician, requested a CT scan of his upper abdomen to asses the status of his (Masangcay) right kidney, even though the urinalysis showed no more trace of blood.The result of the scan revealed an obstructing urethrolithiasis on the right kidney with secondary hydronephrosis, i.e., a poorly functioning right kidney where the flow of urine is obstructed by the presence of kidney stones. Due to the aforementioned result, the removal of the nonfunctioning right kidney was advised but Masangcay refused.   Masangcay was then referred to Dr. Reynaldo C. de la Cruz of the National Kidney and Transplant Institute (NKTI) for a second opinion. Thereat, due to right ureterolithiasis,[14] said physician confirmed the need for another operation; thus, on the 17thuntil the 23rd of December 2002, Masangcay was admitted and confined at the NKTI for the following medical procedures, viz:   CYSTOSCOPIC REMOVAL OF DOUBLE-J STENT, LEFT BILATERAL RETROGRADE PYELOGRAM URETEROLITHOTOMY,[15] RIGHT   The foregoing medical procedures proved successful as evidenced by a repeat examination of Masangcays urine, done on 8 January 2003, which yielded a negative result for the presence of blood.   On 29 January 2003, upon follow-up, Dr. dela Cruz pronounced[16] Masangcay fit to resume work[17] as all his laboratory examinations showed normal results. Accordingly, on 30 January 2003, Trans-