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Fig. 1 | JA Clinical Reports

Fig. 1

From: Distinguishing cerebrospinal fluid from mepivacaine using the pH test in patients undergoing elective cesarean section with combined spinal-epidural anesthesia

Fig. 1

pH test paper. a Duotest pH 5.0–8.0®, MACHEREY-NAGEL GmbH & Co. KG. These indicator papers show two different colors for each pH value at intervals of 0.3–1 pH units. This allows for more accurate reading and a good estimation of intermediate values. The two sidebands are indicators and change color. The white center band separates the above two bands to avoid fusion of the indicator dyes. The pH value of the target sample is decided by comparing its color with this color chart. b Mepivacaine on a pH test paper. It is a representative sample of mepivacaine determined to have a pH of 6.2. c Cerebrospinal fluid on a pH test paper. The upper part of the figure corresponds to the center of a. It is a representative sample of CSF determined to have a pH of 7.7

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