In The Unicode Standard, Lao script implementation is discussed in  Chapter 16 Southeast Asia.

The Lao script was encoded in The Unicode Standard version 1.0. The script is encoded in the following block:

BlocksCharacter RangeAdded in Unicode VersionUnicode Chart
Lao 0E80..0EFF 1.0  U0E80.pdf

Subsequent to version 1.0, the following characters have been added to the Lao script:

CharactersUnicode VersionDocumentation
0EDE..0EDF 6.1  n3893R.pdf/ L2/10-335

Documentation refers to  ISO Working Group and Unicode proposals

A number of proposals for its inclusion were submitted to the Unicode Technical Committee and WG2:

1998-02-27 KIP SIGN - Laotian Currency Sign — V.S. Umamaheswaran ( WG2 N1720.doc,  WG2 N1720,  L2/98-061)

2000-01-06 Row 0E – LAO (collection 26) — Sato, WG2 ( WG2 N2162.doc,  L2/00-054)

2001-03-23 Lao Script - inquiry — Boualoykhong Chansavat ( L2/01-132)

2002-01-14 Character Properties for avagrahas, etc. — Kenneth Whistler ( L2/02-017)

2003-06-12 Thai and Lao collation weighting rules — Kent Karlsson ( L2/03-185)

2004-03-09 Ordering rules for Khmer, Thai, and Lao; CTT suggestion — Kent Karlsson ( WG2 N2717.doc,  L2/04-110)

2004-03-09 Ordering rules for Khmer, Thai, and Lao; suggestions for annex C.2 changes and a new annex B.5 — Kent Karlsson ( WG2 N2718.doc,  L2/04-111)

2005-10-30 Note on Lao Character Names — Andrew West ( L2/05-357)

2006-07-27 Re: document Sk vs Lm vs C — Martin Hosken ( L2/06-243)

2009-08-03 Grapheme break changes, especially for Thai and Lao — Peter Edberg ( L2/09-265)

2010-09-17 Proposal to change UAX#29 in response to Thai, Lao, Tai Dam user needs — Martin Hosken ( L2/10-460)

2010-10-05 Proposal to add minority characters to Lao script (revised; WG2 N3893R) — Martin Hosken ( WG2 N3893,  L2/10-335)

2011-04-18 Proposal to change grapheme extending properties of various characters — Martin Hosken ( L2/11-114)

2017-07-20 Proposal to Encode Lao Characters for Pali (revised) — Vinodh Rajan, et al ( L2/17-106)

Recommendations to UTC #152 July-August 2017 on Script Proposals ( L2/17-255) (See point 6.)

UTC #152 Minutes ( L2/17-222) (See D.4 for decision and action items)

2017-08-02 Comments on the encoding of Lao Letters Pali JHA and NYA — Weizhe Zheng, Yihua Wang ( L2/17-285)