[Heirlooms](https://wow.gamepedia.com/Heirloom "Heirloom")were introduced in[Patch 3.0.3](https://wow.gamepedia.com/Patch_3.0.3 "Patch 3.0.3")and added to the Collections window in[Patch 6.1.0](https://wow.gamepedia.com/Patch_6.1.0 "Patch 6.1.0"). [C\_Heirloom.CanHeirloomUpgradeFromPending](https://wow.gamepedia.com/API_C_Heirloom.CanHeirloomUpgradeFromPending "API C Heirloom.CanHeirloomUpgradeFromPending")(itemID) [C\_Heirloom.CreateHeirloom](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.CreateHeirloom&action=edit&redlink=1 "API C Heirloom.CreateHeirloom (page does not exist)")(itemID) [C\_Heirloom.GetClassAndSpecFilters](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.GetClassAndSpecFilters&action=edit&redlink=1 "API C Heirloom.GetClassAndSpecFilters (page does not exist)")() [C\_Heirloom.GetCollectedHeirloomFilter](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.GetCollectedHeirloomFilter&action=edit&redlink=1 "API C Heirloom.GetCollectedHeirloomFilter (page does not exist)")() [C\_Heirloom.GetHeirloomInfo](https://wow.gamepedia.com/API_C_Heirloom.GetHeirloomInfo "API C Heirloom.GetHeirloomInfo")(itemID) [C\_Heirloom.GetHeirloomItemIDFromDisplayedIndex](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.GetHeirloomItemIDFromDisplayedIndex&action=edit&redlink=1 "API C Heirloom.GetHeirloomItemIDFromDisplayedIndex (page does not exist)")(heirloomIndex) [C\_Heirloom.GetHeirloomItemIDs](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.GetHeirloomItemIDs&action=edit&redlink=1 "API C Heirloom.GetHeirloomItemIDs (page does not exist)")() [C\_Heirloom.GetHeirloomLink](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.GetHeirloomLink&action=edit&redlink=1 "API C Heirloom.GetHeirloomLink (page does not exist)")(itemID) [C\_Heirloom.GetHeirloomMaxUpgradeLevel](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.GetHeirloomMaxUpgradeLevel&action=edit&redlink=1 "API C Heirloom.GetHeirloomMaxUpgradeLevel (page does not exist)")(itemID) [C\_Heirloom.GetHeirloomSourceFilter](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.GetHeirloomSourceFilter&action=edit&redlink=1 "API C Heirloom.GetHeirloomSourceFilter (page does not exist)")(source) [C\_Heirloom.GetNumDisplayedHeirlooms](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.GetNumDisplayedHeirlooms&action=edit&redlink=1 "API C Heirloom.GetNumDisplayedHeirlooms (page does not exist)")() [C\_Heirloom.GetNumHeirlooms](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.GetNumHeirlooms&action=edit&redlink=1 "API C Heirloom.GetNumHeirlooms (page does not exist)")() [C\_Heirloom.GetNumKnownHeirlooms](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.GetNumKnownHeirlooms&action=edit&redlink=1 "API C Heirloom.GetNumKnownHeirlooms (page does not exist)")() [C\_Heirloom.GetUncollectedHeirloomFilter](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.GetUncollectedHeirloomFilter&action=edit&redlink=1 "API C Heirloom.GetUncollectedHeirloomFilter (page does not exist)")() [C\_Heirloom.IsHeirloomSourceValid](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.IsHeirloomSourceValid&action=edit&redlink=1 "API C Heirloom.IsHeirloomSourceValid (page does not exist)")(source) [C\_Heirloom.IsItemHeirloom](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.IsItemHeirloom&action=edit&redlink=1 "API C Heirloom.IsItemHeirloom (page does not exist)")(itemID) [C\_Heirloom.IsPendingHeirloomUpgrade](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.IsPendingHeirloomUpgrade&action=edit&redlink=1 "API C Heirloom.IsPendingHeirloomUpgrade (page does not exist)")() [C\_Heirloom.PlayerHasHeirloom](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.PlayerHasHeirloom&action=edit&redlink=1 "API C Heirloom.PlayerHasHeirloom (page does not exist)")(itemID) [C\_Heirloom.SetClassAndSpecFilters](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.SetClassAndSpecFilters&action=edit&redlink=1 "API C Heirloom.SetClassAndSpecFilters (page does not exist)")(classID, specID) [C\_Heirloom.SetCollectedHeirloomFilter](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.SetCollectedHeirloomFilter&action=edit&redlink=1 "API C Heirloom.SetCollectedHeirloomFilter (page does not exist)")(boolean) [C\_Heirloom.SetHeirloomSourceFilter](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.SetHeirloomSourceFilter&action=edit&redlink=1 "API C Heirloom.SetHeirloomSourceFilter (page does not exist)")(source, filtered) [C\_Heirloom.SetSearch](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.SetSearch&action=edit&redlink=1 "API C Heirloom.SetSearch (page does not exist)")("searchValue") [C\_Heirloom.SetUncollectedHeirloomFilter](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.SetUncollectedHeirloomFilter&action=edit&redlink=1 "API C Heirloom.SetUncollectedHeirloomFilter (page does not exist)")(boolean) [C\_Heirloom.ShouldShowHeirloomHelp](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.ShouldShowHeirloomHelp&action=edit&redlink=1 "API C Heirloom.ShouldShowHeirloomHelp (page does not exist)")() [C\_Heirloom.UpgradeHeirloom](https://wow.gamepedia.com/index.php?title=API_C_Heirloom.UpgradeHeirloom&action=edit&redlink=1 "API C Heirloom.UpgradeHeirloom (page does not exist)")(itemID) [DoesItemContainSpec](https://wow.gamepedia.com/index.php?title=API_DoesItemContainSpec&action=edit&redlink=1 "API DoesItemContainSpec (page does not exist)")(itemID|"name"|"itemlink", classID\[, specializationID\]) - Unused in FrameXML.