ABPM is conducted while individuals go about their normal daily activities. ABPM can a) provide estimates of mean BP over the entire monitoring period and separately during nighttime and daytime, b) determine the daytime-to-nighttime BP ratio to identify the extent of nocturnal dipping, c) identify the early-morning BP surge pattern, d) estimate BP variability, and e) allow for recog- nition of symptomatic hypotension. The US Centers for Medicaid & Medicare Services and other agencies provide reimbursement for ABPM in patients with suspected white Medicare claims for ABPM between 2007 and 2010 were reimbursed at a median of $52 and were submitted for <1% of beneficiaries.S4.3-3,S4.3-4 A list of devices validated for ABPM is available.S4.3-5,S4.3-6 ABPM and HBPM definitions of high BP use different BP thresholds than those used by the previously mentioned office- based approach to categorize high BP identified in Section 3.1. Table 11 provides best estimates for corresponding home, daytime, nighttime, and 24-hour ambulatory levels of BP, including the values recommended for identification of hypertension with office measurements. Typically, a clinic BP of 140/90 mm Hg corresponds to home BP values of 135/85 mm Hg and toABPM values defined as a daytime SBP/DBP of 135/85 mm Hg, a nighttime SBP/DBP of 120/70 mm Hg, and These thresh- olds are based on data from European, Australian, and Asian populations, with few data available for establishing appropri- ate thresholds for US populations.S4.3-9 S4.3-13 They are provided as a guide but should be interpreted with caution. 