Table 3.

Measurement of pH in Mixed Solutions (Normal Saline or Local Anesthetics and Non-Particulate Steroids)

Non-Particulate Steroids	Normal Saline or Local Anesthetics	Dilution	pH
Betamethasone sodium phosphate 5.2 mg/mL	0.9% Normal saline	1:1	7.83
		1:2	7.83
		1:3	7.83
	0.75% ropivacaine HCl	1:1	7.01
		1:2	6.62
		1:3	6.46
	0.75% levobupivacaine HCl	1:1	6.92
		1:2	6.35
		1:3	6.13
	0.5% bupivacaine HCL	1:1	7.41
		1:2	7.23
		1:3	7.11
	1% lidocaine HCl	1:1	7.31
		1:2	7.16
		1:3	7.03
Dexamethasone disodium phosphate 4 mg/mL	0.9% Normal saline	1:1	7.12
		1:2	6.95
		1:3	6.94
	0.75% ropivacaine HCl	1:1	6.66
		1:2	6.45
		1:3	6.32
	0.75% levobupivacaine HCl	1:1	6.53
		1:2	6.33
		1:3	6.23
	0.5% bupivacaine HCL	1:1	6.79
		1:2	6.67
		1:3	6.59
	1% lidocaine HCl	1:1	6.57
		1:2	6.38
		1:3	6.22
Dexamethasone palmitate 5 mg/mL	0.9% Normal saline	1:1	6.42
		1:2	6.21
		1:3	6.14
	0.75% ropivacaine HCl	1:1	5.4
		1:2	5.21
		1:3	5.08
	0.75% levobupivacaine HCl	1:1	4.87
		1:2	4.71
		1:3	4.65
	0.5% bupivacaine HCL	1:1	5.17
		1:2	5.11
		1:3	5
	1% lidocaine HCl	1:1	5.36
		1:2	5.46
		1:3	5.51