The preoperative evaluation including sampling blood in pediatric patients is hard to perform. However, the knowledge of the baseline cell blood count is important to prepare unexpected surgical bleeding etc.. The invasive procedure for blood sampling in small children is often failed and sometimes induces iatrogenic blood loss and parent's complaints. The Pulse Co-oximetry (Masimo) is recently developed device which can provide noninvasive hemoglobin value. However, the accuracy is controversial. There are studies in pediatric patients during surgery and in ICU. However, the comparison for preoperative evaluation is not analysed. Therefore, the investigators want to evaluate the accuracy for preoperative preparation in pediatric patients.
Name: No treatment
Description: no F/U is neededMeasure: hemoglobin Time: once, preoperative visit anesthetic office
There is one SNP
The R 20L or R25L will be used based on their weight. --- R25L ---