A modular patient monitor comprising: a docking station (101; 601; 850; 950; 1050; 1450; 1550; 1701) in communication with a first display (300; 856; 1511; 1611; 1705; 1802; 2005) and a handheld port (110; 835; 1620), the docking station (101; 601; 850; 950; 1050; 1450; 1550; 1701) configured to provide patient monitoring functionality with respect to a first set of physiological parameters; and a handheld monitor (200; 602; 810; 1200; 1410; 1590; 1690; 1740) removably attachable both mechanically and electrically to the docking station (101; 601; 850; 950; 1050; 1450; 1550; 1701) via the handheld port (110; 835; 1620), the handheld monitor (200; 602; 810; 1200; 1410; 1590; 1690; 1740) having a second display (210; 1591; 1691; 2015), the handheld monitor (200; 602; 810; 1200; 1410; 1590; 1690; 1740) configured to provide patient monitoring functionality with respect to a second set of physiological parameters; wherein when the handheld monitor (200; 602; 810; 1200; 1410; 1590; 1690; 1740) is docked, the first display (300; 856; 1511; 1611; 1705; 1802; 2005) and the second display (210; 1591; 1691; 2015) are visible simultaneously, the first display (300; 856; 1511; 1611; 1705; 1802; 2005) and the second display (210; 1591; 1691; 2015) displaying at least some measurements of the first set of parameters and at least some measurements of the second set of parameters, wherein the at least some measurements comprise at least one of a waveform and a numerical value; characterized in that the at least some measurements of either or both of the first set of parameters and the second set of parameters are spanned across the first display (300; 856; 1511; 1611; 1705; 1802; 2005) and the second display (210; 1591; 1691; 2015). a docking station (101; 601; 850; 950; 1050; 1450; 1550; 1701) in communication with a first display (300; 856; 1511; 1611; 1705; 1802; 2005) and a handheld port (110; 835; 1620), the docking station (101; 601; 850; 950; 1050; 1450; 1550; 1701) configured to provide patient monitoring functionality with respect to a first set of physiological parameters; and a handheld monitor (200; 602; 810; 1200; 1410; 1590; 1690; 1740) removably attachable both mechanically and electrically to the docking station (101; 601; 850; 950; 1050; 1450; 1550; 1701) via the handheld port (110; 835; 1620), the handheld monitor (200; 602; 810; 1200; 1410; 1590; 1690; 1740) having a second display (210; 1591; 1691; 2015), the handheld monitor (200; 602; 810; 1200; 1410; 1590; 1690; 1740) configured to provide patient monitoring functionality with respect to a second set of physiological parameters; wherein when the handheld monitor (200; 602; 810; 1200; 1410; 1590; 1690; 1740) is docked, the first display (300; 856; 1511; 1611; 1705; 1802; 2005) and the second display (210; 1591; 1691; 2015) are visible simultaneously, the first display (300; 856; 1511; 1611; 1705; 1802; 2005) and the second display (210; 1591; 1691; 2015) displaying at least some measurements of the first set of parameters and at least some measurements of the second set of parameters, wherein the at least some measurements comprise at least one of a waveform and a numerical value; characterized in that the at least some measurements of either or both of the first set of parameters and the second set of parameters are spanned across the first display (300; 856; 1511; 1611; 1705; 1802; 2005) and the second display (210; 1591; 1691; 2015).